100 Pounds Clydesdale Bank

Clydesdale Bank's high-denomination notes of this period occupied an awkward commercial niche — the £100 face value made them impractical for ordinary retail use, so they circulated almost exclusively between businesses and financial institutions, often returning to branch vaults quickly and cleanly. That pattern kept attrition low, which is why survivors in decent condition are less rare than one might expect for a note with a four-year issue window.

De La Rue's production for Scottish issuers during the 1960s leaned heavily on intaglio printing for the principal elements, with the watermark serving as the primary anti-counterfeiting measure — modest by later standards, but sufficient for a denomination that rarely passed through many hands.